RTS HS Series Manuale utente

TECHNICAL

MANUAL

This manual should remain with the unit.

RTS Automatic Transfer Switch

A new standard of reliability

The manufacturer cannot anticipate every possible circumstance

that might involve a hazard. The warnings in this manual, and on

tags and decals affixed to the unit are, therefore, not all-inclusive. If

using a procedure, work method or operating technique the manu-

facturer does not specifically recommend, ensure that it is safe for

others. Also make sure the procedure, work method or operating

technique chosen does not render the transfer switch unsafe.

Throughout this publication, and on tags and decals affixed to the

generator, DANGER, WARNING, CAUTION and NOTE blocks are

used to alert personnel to special instructions about a particular

operation that may be hazardous if performed incorrectly or care-

lessly. Observe them carefully. Their definitions are as follows:

DANGER

After this heading, read instructions that, if not

strictly complied with, will result in serious

personal injury, including death.

After this heading, read instructions that, if not

strictly complied with, could result in serious

personal injury, including death.

After this heading, read instructions that, if not

strictly complied with, might result in minor or

moderate injury.

NOTE:

After this heading, read instructions that, if not strictly complied

with, may result in damage to equipment and/or property.

These safety warnings cannot eliminate the hazards that they

indicate. Common sense and strict compliance with the special

instructions while performing the service are essential to prevent-

ing accidents.

Four commonly used safety symbols accompany the DANGER,

WARNING and CAUTION blocks. The type of information each

indicates follows:

This symbol points out important safety informa-

tion that, if not followed, could endanger per-

sonal safety and/or property.

This symbol points out potential explosion

hazard.

This symbol points out potential fire hazard.

This symbol points out potential electrical shock

hazard.

GENERAL HAZARDS 

Any AC generator that is used for backup power if a NORMAL• (UTILITY) power source failure occurs, must be isolated from

the NORMAL (UTILITY) power source by means of an approved

transfer switch. Failure to properly isolate the NORMAL and

STANDBY power sources from each other may result in injury

or death to electric utility workers, due to backfeed of electrical

energy.

Improper or unauthorized installation, operation, service or• repair of the equipment is extremely dangerous and may result

in death, serious personal injury, or damage to equipment and/

or personal property.

Extremelyhighanddangerouspowervoltagesarepresentinside• an installed transfer switch. Any contact with high voltage ter-

minals, contacts or wires will result in extremely hazardous,

and possibly LETHAL, electric shock. DO NOT WORK ON THE

TRANSFER SWITCH UNTIL ALL POWER VOLTAGE SUPPLIES

TO THE SWITCH HAVE BEEN POSITIVELY TURNED OFF.

Only competent, qualified personnel should install, operate• and service this equipment. Adhere strictly to local, state

and national electrical and building codes. When using this

equipment, comply with regulations the National Electrical

Code (NEC), CSA Standard; C22.1 Canadian Electric Code and

Occupational Safety and Health Administration (OSHA) have

established.

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS - This manual contains important instructions that should be followed

during installation and maintenance of the generator and batteries.

SAVE THESE INSTRUCTIONS! Read the following information carefully before attempting to install,

operate or service this equipment. Also read the instructions and information on tags, decals, and

labels that may be affixed to the transfer switch. Replace any decal or label that is no longer legible.

DANGER! Connection of a generator to an electrical system normally supplied by an electric utility

shall be by means of suitable transfer equipment so as to isolate the electric system from utility

distribution system when the generator is operating (Article 701 Legally Required Standby Systems

or Article 702 Optional Standby Systems, as applicable). Failure to isolate electric system by these

means may result in damage to generator and may result in injury or death to utility workers due to

backfeed of electrical energy.



Table of Contents

Safety Rules .................................................Inside Front Cover

Section 1 — General Information............................................2

1.1 Introduction................................................................................2

1.2 Equipment Description................................................................2

1.2.1 Transfer Switch Mechanism..............................................2

1.2.2 Utility Service Disconnect Circuit Breaker..........................2

1.3 Transfer Switch Data Decal.........................................................2

1.4 Transfer Switch Enclosure...........................................................3

1.5 Safe Use Of Transfer Switch........................................................3

Section 2 — Installation..........................................................3

2.1 Introduction to Installation...........................................................3

2.2 Unpacking..................................................................................3

2.3 Mounting....................................................................................3

2.4 Connecting Power Source and Load Lines..................................3

2.5 Connecting Start Circuit Wires....................................................4

Section 3 — Operation............................................................4

3.1 Functional Tests and Adjustments...............................................4

3.2 Manual Operation........................................................................4

3.2.1 Close to Utility Source Side...............................................5

3.2.2 Close to Generator Source Side........................................5

3.2.3 Return to Utility Source Side.............................................5

3.3 Voltage Checks...........................................................................5

3.4 Generator Tests Under Load........................................................6

Section 4 – Notes ....................................................................7

Section 5 – Installation Diagram...........................................10

Section 6 – Electrical Data....................................................14

Section 7 – Exploded Views & Parts Lists.............................17

Section 8 – Warranty...............................................Back Cover

Never handle any kind of electrical device while standing• in water, while barefoot, or while hands or feet are wet.

DANGEROUS ELECTRICAL SHOCK MAY RESULT.

Jewelry conducts electricity and wearing it may cause dan-• gerous electrical shock. Remove all jewelry (such as rings,

watches, bracelets, etc.) before working on this equipment.

If work must be done on this equipment while standing on metal• or concrete, place insulative mats over a dry wood platform.

Work on this equipment only while standing on such insulative

mats.

Never work on this equipment while physically or mentally• fatigued.

Keep the transfer switch enclosure door closed and bolted at all• times. Only qualified personnel should be permitted access to

the switch interior.

In case of an accident caused by electric shock, immediately• shut down the source of electrical power. If this is not possible,

attempt to free the victim from the live conductor but AVOID

DIRECT CONTACT WITH THE VICTIM. Use a nonconducting

implement, such as a dry rope or board, to free the victim from

the live conductor. If the victim is unconscious, apply first aid

and get immediate medical help.

When an automatic transfer switch is installed for a standby• generator set, the generator engine may crank and start at

any time without warning. To avoid possible injury that might

be caused by such sudden start-ups, the system’s automatic

start circuit must be disabled before working on or around

the generator or transfer switch. For that purpose, a SAFETY

DISCONNECT is provided inside the transfer switch. Always

set that switch to its OFF position before working on the equip-

ment. Then place a “DO NOT OPERATE” tag on the transfer

switch and on the generator. Remove the Negative (Neg) or (–)

battery cable.

For authorized service,

reference the dealer locator

number found in the generator

owner’s manual.

Section 1 — General Information

RTS “HS” Type Transfer Switch

1.1 INTRODUCTION

This manual has been prepared especially for the purpose of famil-

iarizing personnel with the design, application, installation, opera-

tion and servicing of the applicable equipment. Read the manual

carefully and comply with all instructions. This will help to prevent

accidents or damage to equipment that might otherwise be caused

by carelessness, incorrect application, or improper procedures.

Every effort has been expended to make sure that the contents

of this manual are both accurate and current. The manufacturer,

however, reserves the right to change, alter or otherwise improve

the product at any time without prior notice.

1.2 EQUIPMENT DESCRIPTION

The automatic transfer switch is used for transferring electrical

load from a UTILITY (NORMAL) power source to an GENERATOR

(STANDBY) power source. Such a transfer of electrical loads

occurs automatically when the UTILITY power source has failed or

is substantially reduced and the GENERATOR source voltage and

frequency have reached an acceptable level. The transfer switch

prevents electrical feedback between two different power sources

(such as the UTILITY and GENERATOR sources) and, for that rea-

son, codes require it in all standby electric system installations.

The transfer switch consists of a transfer mechanism, UTILITY

SERVICE DISCONNECT circuit breaker, a relay control, fuses, and

a terminal strip for connection of sensing wires.

This transfer switch is suitable for use as service equipment.

1.2.1 TRANSFER SWITCH MECHANISM

These switches (Figure 1.1) are used with a single-phase system,

when the single-phase NEUTRAL line is to be connected to a

Neutral Lug and is not to be switched.

Solderless, screw-type terminal lugs are standard.

Switch Wire Conductor Tightening

Rating Range Torque

100A #14-1/0 AWG 50 in-lbs.

200A #6-250 MCM 275 in-lbs.

This transfer switch is suitable for control of motors, electric dis-

charge lamps, tungsten filament and electric heating equipment

where the sum of motor full load ampere ratings and the ampere

ratings of other loads do not exceed the ampere rating of the

switch and the tungsten load does not exceed 30 percent of the

switch rating.

This UL listed transfer switch is for use in optional standby sys-

tems only.

This transfer switch is suitable for use on a circuit capable of

10,000 (100A) symmetrical amperes, 240 VAC maximum.

Figure 1.1 — Typical ATS Transfer Mechanism

UTILITY

CLOSING

COIL

GENERATOR

CLOSING

COIL

UTILITY LUGS

GENERATOR

LUGS (E1 & E2)

LOAD LUGS (T1 & T2)

1.2.2 UTILITY SERVICE DISCONNECT CIRCUITBREAKER

The utility service and generator disconnect circuit breakers for the

100 amp models are:

Siemens, Type BQ, 2-pole• 120/240VAC, 100A• 50/60 Hertz• Heating, Air Conditioning and Refrigeration (HACR) rated• Wire range: #1 - #8 AWG.• The conductor tightening torque is 50 in-lbs.•

The utility service circuit breaker for the 200 amp models are:

Siemens, Type ON, 2-pole• 120/240VAC, 200A• 50/60 Hertz• Wire range: 300 MCM - 1 STR (Line), 250 MCM - 6 STR• (Load - ATS)

The conductor tightening torque is 250 in-lbs. (Line), 275 in-• lbs. (Load - ATS)

1.3 TRANSFER SWITCH DATA

DECAL

A DATA DECAL is permanently affixed to the transfer switch enclo-

sure. Use this transfer switch only with the specific limits shown

on the DATA DECAL and on other decals and labels that may be

affixed to the switch. This will prevent damage to equipment and

property.

When requesting information or ordering parts for this equipment,

make sure to include all information from the DATA DECAL.

Record the Model and Serial numbers in the space provided below

for future reference.

MODEL #

SERIAL #

1.4 TRANSFER SWITCH

ENCLOSURE

The standard switch enclosure is a UL listed type 3R. UL type 3R

enclosures primarily provide a degree of protection against falling

rain and sleet and is undamaged by the formation of ice on the

enclosure.

1.5 SAFE USE OF TRANSFER

SWITCH

Before installing, operating or servicing this equipment, read the

SAFETY RULES (inside front cover) carefully. Comply strictly

with all SAFETY RULES to prevent accidents and/or damage to

the equipment. The manufacturer recommends that a copy of the

SAFETY RULES are posted near the transfer switch. Also, be sure

to read all instructions and information found on tags, labels and

decals affixed to the equipment.

Three publications that outline the safe use of transfer switches

are the following:

NFPA 70; National Electrical Code• NFPA 70E; Standard for Electrical Safety in the Workplace• UL 1008, STANDARD FOR SAFETY-AUTOMATIC TRANSFER• SWITCHES NOTE:

It is essential to use the latest version of any standard to ensure

correct and current information.

2.1 INTRODUCTION TO

INSTALLATION

This equipment has been wired and tested at the factory. Installing

the switch includes the following procedures:

Mounting the enclosure.• Connecting power source leads and load leads.• Connecting the generator sensing and transfer relay circuits.• Connecting any auxiliary contact (if needed)• Testing functions.•

2.2 UNPACKING

Carefully unpack the transfer switch. Inspect closely for any dam-

age that might have occurred during shipment. The purchaser must

file with the carrier any claims for loss or damage incurred while in

transit.

Check that all packing material is completely removed from the

switch prior to installation.

2.3 MOUNTING

Mounting dimensions for the transfer switch enclosure are in this

manual. Enclosures are typically wall-mounted. See “Installation

Diagram”.

Handle transfer switches carefully when install-

ing. Do not drop the switch. Protect the switch

against impact at all times, and against con-

struction grit and metal chips. Never install a

transfer switch that has been damaged.

This transfer switch is mounted in a UL type 3R enclosure. It can

be mounted outside or inside and should be based on the layout

of installation, convenience and proximity to the utility supply and

load center.

Install the transfer switch as close as possible to the electrical

loads that are to be connected to it. Mount the switch vertically to

a rigid supporting structure. To prevent switch distortion, level all

mounting points. If necessary, use washers behind mounting holes

to level the unit.

2.4 CONNECTING POWER SOURCE

AND LOAD LINES

DANGER

Make sure to turn OFF both the UTILITY

(NORMAL) and GENERATOR ( STANDBY) power

supplies before trying to connect power source

and load lines to the transfer switch. Supply

voltages are extremely high and dangerous.

Contact with such high voltage power supply

lines causes extremely hazardous, possibly

lethal, electrical shock.

Wiring diagrams and electrical schematics are provided in this

manual. NOTE:

All installations must comply with national, state and local

codes. It is the responsibility of the installer to perform an

installation that will pass the final electrical inspection.

The utility supply connection is made at the UTILITY SERVICE DIS-

CONNECT circuit breaker terminals. The generator and customer

supply load connections are made at the transfer switch mecha-

nism, inside the switch enclosure.

Conductor sizes must be adequate to handle the maximum cur-

rent to which they will be subjected, based on the 75°C column of

tables, charts, etc. used to size conductors. The installation must

comply fully with all applicable codes, standards and regulations.

All power cables must enter the enclosure through the knockouts

provided. If not using the knockouts, conduit entry into the enclo-

sure must be at or below knockouts to maintain the Type 3R rating.

Conduits should be arranged to provide separation between the

Utility and Generator supply conductors inside the enclosure.

Section 2 — Installation

RTS “HS” Type Transfer Switch

Section 3 — Operation

RTS “HS” Type Transfer Switch

Before connecting wiring cables to terminals, remove any surface

oxides from the cable ends with a wire brush. If ALUMINUM con-

ductors are used, apply corrosion inhibitor to conductors. Tighten

terminal lugs to the torque values on "Utility Service Disconnect

Circuit Breaker", and on the decal located on the inside of the door.

After tightening terminal lugs, carefully wipe away any excess cor-

rosion inhibitor.

Use a torque wrench to tighten the conduc-

tors, being sure not to overtighten, or damage

to the switch base could occur. If not tightened

enough, a loose connection would result, caus-

ing excess heat which could damage the switch

base.

Connect power source load conductors to clearly marked transfer

mechanism terminal lugs as follows

1. Connect UTILITY (NORMAL) power source cables to UTILITY

SERVICE DISCONNECT circuit breaker.

2. Connect the GENERATOR (STANDBY) source power cables to

switch terminals E1, E2.

3. Connect customer LOAD leads to switch terminals T1, T2.

Conductors must be properly supported, of approved insulative

qualities, protected by approved conduit, and of the correct wire

gauge size in accordance with applicable codes.

Be sure to maintain proper electrical clearance between live metal

parts and grounded metal. Allow at least 1/2 inch for 100-400

amp circuits.

2.5 CONNECTING START CIRCUIT

WIRES

Control system interconnections consist of N1 and N2, and leads

23 and 194/15B. Control system interconnection leads must

be run in a conduit that is separate from the AC power lead.

Recommended wire gauge sizes for this wiring depends on the

length of the wire, as recommended in the following chart:

MAXIMUM WIRE LENGTH RECOMMENDED WIRE

SIZE

460 feet (140m) No. 18 AWG.

461 to 730 feet (223m) No. 16 AWG.

731 to 1,160 feet (354m) No. 14 AWG.

1,161 to 1,850 feet (565m) No. 12 AWG.

3.1 FUNCTIONAL TESTS AND

ADJUSTMENTS

Following transfer switch installation and interconnection,

inspect the entire installation carefully. A competent, qualified

electrician should inspect it. The installation should comply

strictly with all applicable codes, standards, and regulations.

When absolutely certain the installation is proper and correct,

complete a functional test of the system.

Perform functional tests in the exact order pre-

sented in this manual, or damage could be done

to the switch.

IMPORTANT: Before proceeding with functional tests, read and

make sure all instructions and information in this section are

understood. Also read the information and instructions of labels

and decals affixed to the switch. Note any options or accessories

that might be installed and review their operation.

3.2 MANUAL OPERATION

DANGER

Do NOT manually transfer under load.

Disconnect transfer switch from all power

sources by approved means, such as the main

circuit breaker(s).

A manual HANDLE is shipped with the transfer switch. Manual

operation must be checked BEFORE the transfer switch is operated

electrically. To check manual operation, proceed as follows:

1. Turn the generator’s AUTO/OFF/MANUAL switch to OFF.

2. Turn OFF both UTILITY (service disconnect circuit breaker)

and GENERATOR (generator main line circuit breaker) power

supplies to the transfer switch.

3. Note position of transfer mechanism main contacts by

observing the moveable contact carrier arm. This can be

viewed through the long narrow slot in the inside cover of the

ATS. The top of the moveable contact carrier arm is yellow to

be easily identified.

• Manual operation handle in the UP position - LOAD terminals

(T1, T2) are connected to UTILITY terminals (N1, N2).

• Manual operation handle in the DOWN position - LOAD termi-

nals (T1, T2) are connected to EMERGENCY terminals (E1,

E2).

Do not use excessive force when operating the

transfer switch manually or damage could be

done to the manual handle.

3.2.1 CLOSE TO UTILITY SOURCE SIDE

Before proceeding, verify the position of the switch by observing

the position of manual operation handle in Figure 3.1. If the handle

is UP, the contacts are closed in the NORMAL (UTILITY) position,

no further action is required. If the handle is DOWN, proceed with

Step 1.

Step 1: With the handle inserted into the moveable contact carrier

arm, move handle UP. Be sure to hold on to the handle as

it will move quickly after the center of travel.

Step 2: Remove manual operating handle from moveable contact

carrier arm. Return handle to storage bracket.

3.2.2 CLOSE TO GENERATOR SOURCE SIDE

Before proceeding, verify the position of the switch by observ-

ing the position of the manual operation handle in Figure 3.1. If

the handle is DOWN, the contacts are closed in the GENERATOR

(STANDBY) position. No further action is required. If the handle is

UP, proceed with Step 1.

Step 1: With the handle inserted into the moveable contact carrier

arm, move the handle DOWN. Be sure to hold on to the

handle as it will move quickly after the center of travel.

Step 2: Remove manual operating handle from moveable contact

carrier arm. Return handle to storage bracket.

3.2.3 RETURN TO UTILITY SOURCE SIDE

Step 1: Manually actuate switch to return manual operating handle

to the UP position.

Step 2: Remove manual operating handle from moveable contact

carrier arm. Return handle to storage bracket.

3.3 VOLTAGE CHECKS

1. Turn ON the UTILITY power supply to the transfer switch using

the UTILITY SERVICE DISCONNECT circuit breaker.

DANGER

PROCEED WITH CAUTION. THE TRANSFER

SWITCH IS NOW ELECTRICALLY HOT.

CONTACT WITH LIVE TERMINALS RESULTS IN

EXTREMELY HAZARDOUS AND POSSIBLY FATAL

ELECTRICAL SHOCK.

2. With an accurate AC voltmeter, check for correct voltage.

Measure across ATS terminal lugs N1 and N2. Also check N1

to NEUTRAL and N2 to NEUTRAL.

3. When certain that UTILITY supply voltage is correct and compat-

ible with transfer switch ratings, turn OFF the UTILITY supply to

the transfer switch.

4. On the generator panel, set the AUTO/OFF/ MANUAL switch to

MANUAL position. The generator should crank and start.

Section 3 — Operation

RTS “HS” Type Transfer Switch

Attach handle to

the moveable contact

carrier arm.

Move handle UP for the

NORMAL (UTILITY) position.

Move handle DOWN for the

GENERATOR (STANDBY)

position.

NOTE: Return handle to

storage position in enclosure

when finished with manual transfer.

Figure 3.1 — Actuating Transfer Switch

5. Let the generator stabilize and warm up at no-load for at least

five minutes.

6. Set the generator's main circuit breaker (CB1) to its ON or

CLOSED position.

DANGER

PROCEED WITH CAUTION. GENERATOR

OUTPUT VOLTAGE IS NOW BEING DELIVERED

TO TRANSFER SWITCH TERMINALS.

CONTACT WITH LIVE TERMINALS RESULTS

IN EXTREMELY DANGEROUS AND POSSIBLY

FATAL ELECTRICAL SHOCK.

7. With an accurate AC voltmeter and frequency meter, check the

no-load, voltage and frequency.

Measure across ATS terminal lugs E1 to E2. Also check E1 to

NEUTRAL and E2 to NEUTRAL.

a. Frequency....................................................60-62 Hertz

b. Terminals E1 to E2.......................................240-246 VAC

c. Terminals E1 to NEUTRAL............................120-123 VAC

d. Terminals E2 to NEUTRAL............................120-123 VAC

8. Set the generator’s main circuit breaker (CB1) to its OFF or

OPEN position.

9. Set the AUTO/OFF/MANUAL switch to the OFF position to shut

down the generator. NOTE:

Do NOT proceed until generator AC output voltage and fre-

quency are correct and within stated limits. If the no-load volt-

age is correct but no-load frequency is incorrect, the engine

governed speed may require adjustment. If no-load frequency

is correct but voltage is not, the voltage regulator may require

adjustment.

3.4 GENERATOR TESTS UNDER

LOAD

1. Set the generator's main circuit breaker to its OFF or OPEN

position.

2. Set the UTILITY SERVICE DISCONNECT circuit breaker to the

OFF position.

3. Manually actuate the transfer switch main contacts to

their GENERATOR (STANDBY) position. Refer to "Manual

Operation".

4. To start the generator, set the AUTO/OFF/ MANUAL switch to

MANUAL. When engine starts, let it stabilize for a few min-

utes.

5. Turn the generator's main circuit breaker to its ON or CLOSED

position. The generator now powers all LOAD circuits. Check

generator operation under load as follows:

• Turn ON electrical loads to the full rated wattage/amper-

age capacity of the generator. DO NOT OVERLOAD.

• With maximum rated load applied, check voltage and

frequency across transfer switch terminals E1 and E2.

Voltage should be greater than 230VAC and frequency

should be greater than 59 Hertz.

• Let the generator run under rated load for at least 30 min-

utes. With unit running, listen for unusual noises, vibra-

tion, overheating, etc., that might indicate a problem.

6. When checkout under load is complete, turn the generator's

main circuit breaker to its OFF or OPEN position.

7. Let the generator run at no-load for several minutes. Then,

shut down by setting the AUTO/OFF/MANUAL switch to its

OFF position.

8. Move the transfer switch's main contacts back to their UTIL-

ITY position. For example, LOAD connected to UTILITY power

supply. Refer to "Manual Operation". Handle and operating

lever of transfer switch should be in the UP position.

9. Turn on the utility power supply to transfer switch, using the

UTILITY SERVICE DISCONNECT circuit breaker. The utility

power source now powers the loads.

10. Set the generator's AUTO/OFF/MANUAL switch to its AUTO

position.

Section 3 — Operation

RTS “HS” Type Transfer Switch

Section 4 — Notes

RTS “HS” Type Transfer Switch

Section 4 — Notes

RTS “HS” Type Transfer Switch

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